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kF� <br /> rr <br /> I' <br /> TABLE 1 <br /> UST OVEREXCAVATION:SOIL SAMPLE ANALYSES <br /> Village West Marina, Stockton-San Joaquin County <br /> ;j Results expressed in mg/Kg <br /> EP is i .Mctlrcid . ...FsPAMethod.fiq. CA,YUFT <br /> ;. <br /> $Q1S,U1od' 12!87 <br /> Sample 17at fatal Drgante <br /> lYo artkp�ed TTH'g >3enzene , Tolu rite >sUtylhe lzene 7Xyleia s Lead <br /> f N-Bottom 07/20/93 4.3 0.065 0.038 0.14 0.57 ND <br /> 5-Bottom 07/20/93 340 5.8 13 8.9 44 ND <br /> N-Wall 07/20/93 330 0.69 0.44 3.4 15 NA <br /> S-Wail 07/20/93 4.7 0.68 0.016 0.46 1.2 NA <br /> E-Wall 07/20/93 ND ND ND ND ND NA <br /> W-Wall 07/20/93 ND ND ND ND ND NA <br /> z: Reporting 1 mg/Kg 0.005 mg/Kg 0.05 <br /> Limits mg/Kg <br /> ND Not detected above the reporting limit of the laboratory test. <br /> NA Not analyzed <br /> -_- Laboratory analyses by Sequoia Analytical of Concord <br /> The excavation was backfilled in May of 1994 subsequent to collection of stockpile soil samples <br /> for single-sample-composite analyses in order to detect residual TPH-g and TRPH-d analytes. <br /> Favorable results (all analytes were nondetectable) allowed for stockpile backfill were approved <br /> in a letter dated May 10, 1994 from Specialist Collins to Mr. Dwight Davis of the Pegasus <br /> Group. <br /> <, Hydropunch' Sampling <br /> Under the supervision of Specialist Collins, three Hydropunch'boreholes (HP-1, HP-2, and HP- <br /> = 3 shown on the Site Sketch, Figure 2 and the Ground-Water Gradient Map, Figure 3) were <br /> =3 drilled near the north, east, and west flanks of the overexcavation. Borehole soil samples were <br /> logged at five-foot intervals by the W.W. Irwin, Inc. field geologist; the samples were chilled <br /> and retained for laboratory analyses, but the analyses were not required by the SJCPHS-EHD. <br /> Ground water was encountered at an average depth of 23.7 feet below surface grade (bsg). <br /> ;r=1 When analyzed, the ground-water samples collected from HP-1 and HP-2 revealed BTEX <br /> ' analytes in nondetectable or fractional concentrations; the sample from HP-1 exhibited 86 µg10 <br /> of TPH-gasoline. When analyzed, the sample collected from HP-3 exhibited TPH-g at 360 <br /> µgl f, and a benzene concentration of 160 ggl i, prompting the SJCPHS-EHD to order the <br /> completion of three monitoring wells for ground-water direction and gradient determination, and <br /> possible definition of the contaminant migratory path. See Table lA for analytical results. <br /> i <br /> W.W. Irwin, Inc. <br /> Project No. 33016.06 <br /> — <br /> April 1996 3 <br />